Taking online payments

I'm working on a website for a local window cleaning service in AZ. I live in Russia. I might not even need a payment tool on a website, but I'm considering the option. Maybe some people will be interested in buying a gift card for their friends or relatives for a window cleaning. Who knows. I was wondering if the prepay for an order with a discount will be an interesting option or now. I need to talk to my uncle who does the cleaning for years to know what his customers like and how the payment goes. 
For now, I researched the Pay pal. My question was, how many Americans actually use it. But then I learned that to pay with a pay pal you don't actually need an account. You can simply use your credit card which is convenient.   
We can try and test it if my uncle likes an idea. 
Here are some great articles to read for more information:
 PayPal Payments Standard and A Simpler Way to Pay.

You can even create a “Buttons for shopping cart purchases" easily in 2 minutes. The button options are shopping cart, buy now, donation, gift certificate, subscription, automatic billing, and installment plan.   

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